Regular Expressions 101

All the errors detected are listed below, from left to right, as they appear in the pattern.

(?<= Lookbehind must have a fixed width

/ Delimiter must be escaped with `\`

) Lookbehind must have a fixed width

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=</)\x20+(?=\w+>)

This is title
<p>There is unwanted space< /p>
<h1>There is unwanted space< /h1>
<div>There is unwanted space< /div >